<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <!-- 添加角色按钮区域 -->
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="roleslist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bdbottom',i1 === 0?'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightsById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级权限 -->
                            <el-col :span="19">
                                <el-row :class="[i2 === 0?'':'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success" closable @close="removeRightsById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag v-for="(item3) in item2.children" :key="item3.id" type="warning"
                                        closable @close="removeRightsById(scope.row,item3.id)">
                                            {{item3.authName}}
                                        </el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- <pre>{{scope.row}}</pre> -->
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                        <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightsDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%" @close ="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightslist" :props="treeProps" show-checkbox
            node-key="id" default-expand-all :default-checked-keys="defKeys"
            ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="alloRights">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data () {
    return {
      roleslist: [],
      //   是否展示分配权限对话框
      setRightDialogVisible: false,
      rightslist: [],
      //   定义树形控件props根据什么拿，拿什么
      treeProps: {
        //   拿的文本
        label: 'authName',
        // 根据
        children: 'children'
        // 默认已选中的节点的id的绑定
      },
      defKeys: [],
      //   这是监听到的正在分配角色的id
      roleId: ''
    }
  },
  created () {
    this.getRolesList()
  },
  methods: {
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败！')
      }
      this.roleslist = res.data
    },
    // 根据ID删除对应的权限
    async removeRightsById (role, rightsID) {
      // 弹框提示用户是否删除
      const confirmResult = await
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      }
      //   console.log('确认了删除！')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightsID}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除此权限失败！')
      }
      //   this.getRolesList()
      //   调用getlist会使整个页面重新渲染，会使页面回到一开始的状态
      // 本方法中从scope中拿到的行内数据role双向绑定，获取api接口的data改变后
      // 直接替换，可以避免重新渲染整个页面
      role.children = res.data
      this.$message.success('删除权限成功！')
    },
    // 展示分配权限对话框
    async showSetRightsDialog (role) {
      // 获取列表数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限树失败！')
      }
      // 把获取到的权限数据保存到rightslist中
      this.rightslist = res.data
      //  递归获取的三权限的节点的id
      this.getLeafKeys(role, this.defKeys)

      //   把获取到的角色id保存到roleId中
      this.roleId = role.id

      this.setRightDialogVisible = true
    },
    // 通过递归，获取角色下的所有三级权限的id，并保存在defKeys中
    getLeafKeys (node, arr) {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      } else {
        node.children.forEach(item => {
          return this.getLeafKeys(item, arr)
        }
        )
      }
    },
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async alloRights () {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idstr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idstr
      })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.roleId = []
      this.setRightDialogVisible = false
    }
  }

}
</script>

<style lang="less" scoped>
.el-tag {
    margin: 7px;
}
.bdtop {
    border-top: 1px solid #eee;
}
.bdbottom {
    border-bottom: 1px solid #eee
}
.vcenter {
    display: flex;
    align-items: center
}
</style>
